Malicious PDF — malware analysis report

Static analysis result for SHA-256 289589dc9bd9e7ac…

MALICIOUS

PDF

94.2 KB Created: 2021-03-31 11:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 597437080cf9e5888593e564c0cb0df0 SHA-1: 72d8a65ef9e75b3828f96c3b4f4f82b60e1c2c40 SHA-256: 289589dc9bd9e7acc2b1884dc351d63d8792cba422120a64cd1c4c3abc0d3f9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to academic topics, aiming to direct users to potentially harmful websites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/award?keyword=relation+between+cartesian+and+polar+coordinates+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464700/normal_60641a8e134c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ffcd931a970c.pdfIn PDF document text
    • http://dufapun.22web.org/95700205834.pdfIn PDF document text
    • http://menajaf.iblogger.org/65944394280.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/aa_meetings_on_zoom_san_diego.pdfIn PDF document text
    • http://lapivakop.getenjoyment.net/941_quarterly_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fewasav.rf.gd/learn_russian.pdfIn PDF document text
    • http://rajafebinolug.epizy.com/jamilobusemuwixo.pdfIn PDF document text
    • http://zabukek.rf.gd/xikisifolidem.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/clumsy_ninja_offline_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/the_neverending_story_cast_then_and_now.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_3588dfc4cf6842568743595e099e6b54.pdf?index=trueIn PDF document text
    • http://vafotapezetu.rf.gd/17201167632.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/condition_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/53350853212.pdfIn PDF document text
    • http://jorezegirun.rf.gd/benediktova_opcija.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_5f291d454de14ec48f4846b6c4932651.pdf?index=trueIn PDF document text
    • http://zuvidetalenaras.epizy.com/les_fleurs_du_mal_rsum_par_chapitre.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 4432 bytes
SHA-256: 24e11b6734cd5e7cd0cea3923252a9f0e4745093465051b089597526933b8d54
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 5176 bytes
SHA-256: 37d8489b566069bd5e04faa09cad99c72f48b39393488ddffded5a83484131e6
font_02_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 12364 bytes
SHA-256: 6891f5213caa365e2d60790d4be111e7a6231cd54aa6a0073b03e65fcf4912f5
font_03_sfnt_off00015cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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